The multiwavelength mode-locked fiber laser with a micro-fiber loop is proposed. The fiber laser is composed of two parts, the 8-shaped laser cavity and the micro-fiber loop. The mode-locked mechanism is based on the equivalent saturable absorption effect of nonlinear amplifying loop mirror. The micro-fiber loop fabricated through twisting the taped fiber is incorporated on the side of the unidirectional laser cavity, which results in a phase difference when the light with different wavelengths pass through the micro-fiber loop. Thus, the multi-wavelength mode-locked can be realized. In the experiment, the dual-wavelength mode-locked pulses are obtained by increasing the pump power and adjusting the polarization controller. The multi wavelength mode-locked fiber laser with all-fiber configuration has potential applications in optical sensing, optical measurement, microwave photonics, optical signal processing, terahertz generation and wavelength division multiplexing optical transmission system.